Period!🔴 or pregnant?👶🏽

S!
So I'm on birth control but I had sex the 20th and the 21st. I missed a Pill around this time. But got back on track. 
Today is the day of my expected period, I took my last pill last night. I have been spotting the past few days with cm, (stretchy and sometimes creamy) with brown and red discharge. But in minimal amount all day. It's not even enough to soak a panty liner. 
I expected my flow to get heavier today because I was supposed to start today, and it hasn't. Same spotting.
Anyone have experiences like this? Do you think I could be pregnant or should I chalk it up to af? Experiences  more than welcomed!!!! 

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